Building construction block



FIG. 1 is a top view of the construction building block of my new design;

FIG. 2 is a right side elevation view of the building block;

FIG. 3 is a front end view of the building block;

FIG. 4 is a rear end view of the building block;

FIG. 5 is a bottom view of the building block; and

FIG. 6 is a left side elevation view of the building block. 

The ornamental design for a building construction block, as shown and described. 